Spectral energy distribution for Star A. The curve is a blackbody with T = 23,000 K and radius R = 6.1 R _☉ appropriate for a B1.5 V star, interpolated from the data of Drilling & Landolt (2000), with A _V = 5.4 mag and a Cardelli et al. (1989) extinction law in the optical and Indebetouw et al. (2007) extinction law in the mid-IR. A distance of 4.0 kpc yields a good fit.